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From Longman Dictionary of Contemporary Englishdangerousdan‧ger‧ous /ˈdeɪndʒərəs/ ●●●S2W2 adjective1DANGEROUSable or likely to harm or kill you → harmfullaws about dangerous dogsSome of these prisoners are extremely dangerous.highly/very dangerousIt was a highly dangerous situation.dangerous forThe crumbling sidewalks are dangerous for old people.dangerous toThe virus is probably not dangerous to humans.it is dangerous for somebody to do somethingIt’s dangerous for a woman to walk alone at night.The powdered milk was not as good as breast milk, and was downright dangerous (=actually dangerous) when it was mixed with unclean water.2RISKinvolving a lot of risk, or likely to cause problemsSYN riskyThe business is in a dangerous financial position.a politically dangerous strategy3 →dangerous ground/territoryTHESAURUSdangerous likely to cause death or serious harm, or cause something bad to happenSnow and ice are making driving conditions very dangerous.dangerous drugsa dangerous criminalrisky if something is risky, something bad could easily happen or you could easily make a mistakeDoctors said it was too risky to operate.a risky situationhazardous /ˈhæzədəs $ -zər-/ especially writtendangerous – used especially about substances, jobs, and journeyshazardous wastehazardous chemicals hazardous occupationsThe expedition was extremely hazardous.unsafe dangerous because someone is very likely to be hurt – used especially about places or conditionsThe roads are unsafe for cyclists.unsafe working conditionstreacherous /ˈtretʃərəs/ formal or literary places or conditions that are treacherous are very dangerous for anyone who is walking, driving, climbing etc in themThe snow turned to ice, making conditions treacherous for walkers. the island’s treacherous coastlineWith no lighting, the roads can be treacherous.perilous /ˈperələs/ literary a perilous journey, situation etc is very dangerousa perilous journey across the seahigh-risk [only before noun] a high-risk job, situation, or behaviour is likely to be dangerousDrug users need to know that sharing needles is high-risk behaviour.